Subgrade template



Patented May 10, 1927.

ARTHUR-G. FITZN-ER; OF1CHIGAGO.HEIGHT.S, ILLINOIS..

summum semanita-ai Application filed .September ported on. side formsv substantially` every portion. ot thev subj-grade istested, and all highi spotsT are. encountered;V byVA the Seraping teeth which loosen, the y earth, permittingvthe template proper; to level :the subfgrade toits proper.l elevation; andy contour..

Itis an,y object` otthis inventionto provide af template for concrete road, construction Wol-lr, said template being constructed of. steel and being of aiWeighty suilicient toy permit scrapingv teeth to cutfdovvn andlfurthermore permitting the template .properto reducelthe sub-,grade surtaceto its.propen-elevat-ioniand contour. f

ltv is.; also, an object ot thisL invention.A to p rpvide. asub-grade templateoon-structediol1 steelfadaptedto 4be .dragged along latter. a con? crete mixer to cause ther sub-,grade tob'e properly scraped; andI leveledi to its required elevation and cont-our preparatory tohaving` concrete tromsaid mixer deposited thereonv to a prescribedfdepth to meet; stated requirements.. I y y lt is furtheraniobject of thisinvention to provideay steel; sub-grade template wherein the ends are provided With rollersv toysup-v port the f same. on v. side formsand; also .having rollers engagedfon the inner sides or"I said terms to hold the template: against lateral shitting as it.- is advanced. by:v means. otr a mixer, to cut-V andllevel the sub-grade toits proper elevation andy contour.

lt is furthermore any/object ofzthisinven.- tion to .proifideg' a. subgradeitemplate; of steel construction, to span, a road and carrying adjustable teeth on. its`4 advance. side. and removable template plate sections on the rear side., 7

ltY is an important object-fotthis invention to provide an` improved`- sub-grade template of lea-vy steel construetionv having: adj'lustablecutting teetli onl one side: and" reenforced:

reniiovab'le template plate sections arranged on the other side. so". that as the template is advancedby attaching. the same to a conoretemi'xer the teeth Will'scrape and loosen high' spots to permit the. template plate seet'ons to properly level' the sub-grade to its proper elevation and contour prior to Vthe coveringotthe sub-grade to apredetermined thickness with concrete delivered'trom the mixer which propels the sub-grade template.

@ther and. further important objects of this-invention Willbe apparent from the disclosures in the drawings and specification.

The invention (in a preferredr form). is

illustrated in tliedrawings and hereinafter more fully described;

@n thedrawings.:

Figure l is a plan vievv ot a road under construction showing the side forms and a concrete mixer-having connectedthereto an improved' subgrade. template embodying the principles of this invention.

Figure. 2 is an.. enlarged fragment-ary plan view ofone endv ot. the sub-grade template With parts broken away. and: parts omitted;

Figure 3 isr afront elevationot one end jot tlie sub-grade template showing parts iny section..

Figure l is a rear elevationon a reduced scale-ot, the entire sub-grade template.

Figure 5" is a. detailedv transverse section taken on line VV' ot Figure 2.,

As shown onthe drawings:

The reference numeral l indicates a p roperly constructed road' sub-grade ot' proper elevation and contourl having a port-ion thereofJ covered With concrete Q'poured and leveled;A to proper thickness. to meet road requirements. rPhe reference numeral 3 indicates thatportion ot" the road bed which has not yetv been properly graded by the subgrade template;A 'Removably mounted longitudinally along each side of the road bed are concrete rails or torms Llproperly anchored in position toileteiinine the proper Width ojt-lie'roadandf t'urtlier serving las a tracky upon which horizontal supporting rollers areadapted to run to` hold the. improved" subgrade template supported in its proper posi/tientransversely of the road. The horifzontal rollers are supportedon stub shaft-s 6'v Which are' vertically movable in slotted-j"braeletl plates 7 carryinguset screws Spermttng the; rollers foibe raised-.01 IOW- ereffl'.' with; l'SPeGtitO' Seidl bracketeas desired? ing plates or bars 9 which rigidly support a horizontally positioned steel -beam 10 in position betvveen the pair of roller carrying brackets 7 which form the end members of the sub-grade template.

Rotatably mounted on the bottom side of each of the brackets 7 is a pair of vertical rollers 11 which is adapted to track on the inner faces of the side forms l for the purpose of holding the sub-grade templatelin proper position against lateral shifting with respect to the road bed. The vertical rollers valso act to prevent the template from riding off of the forms. The main TL-beam 10 is positioned with the web thereof in a horizontal position so that the flanges of the supporting beam are vertically disposed with the advance flange of the -beam having a plurality of steel scraping bars or teeth 12 rigidly secured thereon in spaced relation by means of clamps 13 or other suitable means. rlhe teeth 12 are adjustably mounted in position with the lower cutting edges thereof in a line conforming to the contour of the sub-grade which is to be produced. It will thus be seen that the teeth 12 are clamped in a position set at sub-grade elevation to scrape loose all material above sub-grade elevation preparatory to having said cut oil' material leveled to proper elevation by the template proper.

The rear 'flange of the 1-beam 10 has rigidly bolted thereto a plurality of template plate sections 111, the lower edges of which are cut to conform to the contour of the subgrade. The template plate sections 14 are reenforced by means of braces 15. Rigidly Abut removably bolted to the bottom edge of each of the template plate sections 14: is an angle iron protecting shoe 16 to protect the template edges of said template plate sections.

lt will thus be noted that the protecting template shoes may be readily replaced when worn lat a comparatively small cost. The template shoes thus act as guards for the lower edge of the template proper and thereby insure the acoriracy of the template at all times. lt will also be noted that the template plate sections being removably bolted in position permit the same to be removed or changed so that different shapes of subgrades may be readily obtained The improved steel sub-grade template is adapted to be positioned across the road as shown. in Figure 1 with the supporting rollers 5 running on the forms al.. rI`he sub-grade template is adapted to be pulled along by the concrete miner 17 having caterpillar treads 18 and a framework 19. The mixer bucket 20 is supported on a bucket boom 21 which projects rearwardly and may be swung transversely of the linished sub-grade section 1 to permit the concrete to be poured in the positions Where it is needed. The

mixer 17 is also provided with an overflow pan 22 to prevent concrete from dropping in front of the sub-grade template to clog up the template teeth. It will of course be understood that any desired type of concrete mixer may be used for mixing the concrete and for propelling the sub-grade template along the road. Connected to the concrete mixer frame 19 are the ends of a pair of pull rods 23, the other ends of which yare remov ably connected to the end portions of the template I-beam 10.

In case the sub-grade template has been advanced too far and it is desired to back the same up, a pair of cables or rods 211 are secured to the web of the I-beam 10. Said rods 24 areprovided with hooks 25 to permit the same to be hooked to the bucket 20 so that the sub-grade template may be moved backwardly as the bucket is advanced on the boom 21. Vhen this is done it will of course be understood that the pull rods 23 are released from the sub-grade template I-beam 10. As shown in Figure 1, a guiderod or bar 26 is connected to the mixer frame 19 and entends transversely to one .side of the road and is adapted to be advanced along the inner face of one of the forms l to serve as a guide for the purpose or" steering the mixer along the crown or center of the sub-grade. lThe guide member 26 thus acts as a. means whereby the mixer may be held to the crown or middle of the road thereby obvivating any undue side pulls or strains on the sub-grade template. As clearly shown in Fig. 1 the ends of the sub-grade template Lbeam 10 are spaced a short distance from the inner faces of the forms l to permit the sub-grade template to clear or pass over overlapping reenforcing rods or bars which are positioned substantially parallel to the sides of the road adjacent the inner faces of the forms 4L.

The operation is as follows:

In the construction of concrete pavements, after the sub-grade has been prepared to what is believed to be substantially the correr-t elevation and contour, side forms 4l are mounted in position along` the side of the road for the purpose of affording means for building the road to the required width. and along a predetermined er selected path. After the initial pre .iaration of the subgrade, a concrete mixer is run onto the crown of lhe sub-grade und the forward ends of the pull rods 23 are connected to the mixer framework 19 as shown in Figure 1. The rear ends of the pull rods 23 are removably clamped or engaged on the advance flange of the sub-grade template l-beam 10 to permit the sub-grade template to be pulled or dragged behind the mixer as the mixer is advanced along the sub-grade. The improved steel constructed sub-grade template is adapted'to span the road and is supported n by, mea-nsf f ofithe horizontaal? rollers 5: W-hioh:

track along the upper surfaces of the forms.r et? Whieln actl as tracks3 along." Which thee?- sub# grade: templates' isf adaptedi to i bef' advanced;l Tao; prevent! thesub-grade templafteefromv. running?. ot'f of; the formed: and f also :prevents4 ing,I laterall movement,l of the esubfgrade temf plate; tho-verticalirollersfll aire supported. onI the brackets T and; traclef. onqthegl inner*y faces. off thef forms 4L: The#i verticad; rollers 1li are off thinJ construction to: permit thesame` to pass'aho've: theanairginal;reenforoingi rods for the concrete` pavementl which arev placed adjent the innervfacestotthefforrnsi fori the purpose of reenfercing.; the: outer marginsY ot the concreteI road.' when; completech l l Astheconcrete: mixer is: advanced a predetermined distance along z the fsubJgrade the area l (Figuren l); isprepared and tested ready to have concrete pouredthereom Thev area l is fprepared by; means fof the improved. steel constructedsubgrade templatefembody ing,` the Yprinci ples -of=thisx=inventien5 said sub grade template being` of sufficient strengthto' prevent? sagging'` anch alsof adapted; to. ride over the -subfgrradc sin rclosefcontacti therewith l sov tha-t: Aas the sub-grade, template is ad:.` vanced thef teeth;V l2@ whichk are: setvr tos corre-- spondto the-contour otthe template 14; act: as a: meansE for.y scraping;A any; high! spots=in the sub.g1'ade'to loosen thematerial"which, projects@ above the required elevation atx whiclh the sub1-grade' is tobe constructed.- Atteri the: cutting; dow'nr of :the highgspots: inY the: subgrade; by. meansfiofi thefteetll i12? ,the angle iron: Shoes 16.r off the templater 14X ride over the scrapech sub-grade to Vflevel'ithe'samel t'o the f required' elevation'v and: contoun Tihee loosened material; cutaoffbyr the teetliilis eitherf used to tillr ini hollow places; orfmayi beheld by the Jfront offt'hetemplate'until a sufficient.- amountr has-f been: acoumulatedx to Warrant the removaliofrtlie same fromivthe: front ofithe. sub+g1adetemplate The-Weight ofthe steel ssub-gr-ader template `:is: sufficiently,y great to AholdktheY same in itsproper: position' with the, suppontingrollers frestinggon the,- i'orms-d so that a'. highly; accurate finishedJ Sub-grade is-f produeech by means f of the: subs-- gradeV template. y diter. the.r area- 1 ha'svbeenr red needr to `the' required contour and elevation, the concrete mixen is set. infoperationat'o fprepaiefthe concret-e and deposit the same` in the bucket-f Whichis`I` then run out? onf the boom 21 and dumped to deposit the concrete in the area which is to be covered. The boom 2l may be swung into different positions so that Within a very short t-ime the required amount of concrete is poured to cover the area l. Prior to the pouring of the concrete the side reenforcing rods and the centerreenforcing bars may be placed in position so that the concrete is poured around the same'. After the concrete;- has: been poured; into f the desited. positions the; con-creta isi leveledand. fnsl-ed; by any; desired means. so that. theY thielmess of tliwconcreteeover the entire vsul grado: Willl conform i toi the-cI standard. depth requirements.: As:1 the concrete.- is; poured: overrtlieffinished subgrazde ythemixer is ad# Vance-div thereby-rpulling;l the sub-grade 'tem-I plate along,l thefcourse:ofathe'froadto permitthe'rsa'me: ter.continue reduc-ing; thevsu-b-grade to its proper;l cont-oura-- Infcase it. becomes necessary; to movethe sub-gradeftemplate rearwardly to .permitthe removal of; loosened materi al from the fron-ti otthe-rsubvgradea template orptor any other reason the pull rods 23 are releasedfandrthe hooks 25 of the rodsfzef are-hooked tothe A bucheftI QGlWhich maar; be rune outtvardly on they boom 2l tlierebyi` causing: the sub-graded templateeftofbe'fpulled; bachi to the ,position` desired;

Ass-'shown Yin fF'ignrecl, aanoverloxv: pan f 22.- isucarriedf byethefconerete mixe-iw trame 19 belowthe loadingrposition of the` buclzct so that. any:- concrete which is spilled will he deposited.: in. the f overliezw-v pan: auch will not; drop.' in, front L of 'thef subegrade template to elogi theVv teeth;` 12J.

lVhen the sub-grade template is irstf put: in positionf-on the jobiit isqofi course necessaryf tot,l position I thet sub-agrade; template so that iti willi' outa o the grade ati the f proper, elevation: Inio'rder to permit: this adjust ment' of.` they sub-grade template the stubv shafts.;6iicarryingfthe:supp orting roll ers 5 are adjustedi in thef'slottedi bracket; members 7; byfmeans'o-the setfsereW-s; 'Elie rollers 5', mafyr'thus betsetfso that.y the sub-,grade tcm+ plate: will.` be'- properly' positioned; across, the road? toy permita' proper' grading! to the required elevationfandfcontourf,

.FxlrefteetliilQlWhicliare: heldin position :by meansaof' the" clampsll :may be removed'v in-z' dividuallyf when necessaryA so that: an arr rangement is afforde'df wherebyv the teeth may! be' replacedi when: wor-nv or,I broken, or.v adjusted if necessary. The templatefproper.` is constructed at? plurality of.' template sections i each' havingf ai removable angle iron. shoe" sofl that'y any ofi the template sections ortliveE shoes thereon' mayb be removed When Wornat ai substantially small cost-l andi thus piteseme 1 the` aocuracyf of the. template f at. all' timess. It@ will. be. seeni tha-ti byr constructing the;l template; proper, ofi aplurality of;

plateifseetionsa'tliaexpense of:reeuttinlgg:a` new template edge is obviated. It will also be noted that with this construction the template sections may be changed for different shapes of sub-grade and the teeth l2 may be adjusted to conform to the corrected or changed contour of the template proper.

The improved sub-grade` template is of sturdy construction and of suicient Weight to produce an accurate sub-grade for a con lil() llo crete pavement in a substantially short time hereon otherwise than necessitated by the prior art.

I claim as my invention:

l. A sub-grade template comprising a beam, roller supports adjustable on the ends thereof adapted to track over forms on the side of the road to hold the beams supported in posit-ion, guide rollers for guiding the sub-grade template along said forms and over the grade, a plurality of teeth adjustably carried directly on the advanced side of the beam, and a template carried on the rear side of the beam, said teeth being set to conform tothe contour of said template.

2. A sub-grade template comprising a beam, brackets connected to the ends thereof, supporting rollers adjustably mounted on the brackets and adapted .to track on forms on the side of a road under construction, guide rollers on said brackets adapted to track on the inner surface of said forms to guide the course of the sub-grade template over the grade, a plurality of teeth positioned at spaced intervals across the advance side of the beam, clamping means for holding said teeth removably secured in position on the advance side of said beam, a plurality of'template sections removably secured on the rear side of said beam', and shoes removably secured on the template edges of said sections to reenforce and protect the same.

3. A sub-grade template comprising a steel beam adapted to be positioned transversely of a road under construction, roller means at the ends of said beam for supporting the same, teeth secured to one of the flanges of said beam for the purpose of permitting high spots in the sub-grade to be cut down, and a template on another flange of said beam adapted to permit the sub-grade to be reduced to its required contour and elevation.

4. A sub-grade template comprising a steel beam, roller means on the ends thereof for supporting the same, guide rollers carried by said roller means, a plurality of steel teeth positioned in spaced relation across one side of the beam, clamps for removably holding the same secured in position, a plurality of template sections removably secured to the opposite side of said beam, braces for reenforcing the same, and shoes on the lower cutting edges of said sections to reenforce and protect the same.

A sub-grade template comprising a beam adapted to be positionedtransversely of a road under construction, adjustable means lfor supporting the same on the forms on the side of the road, a template on one side of said beam, and a plurality of cutter teeth transversely adjustable on the opposite side of said beam, said cutter teeth being arranged so that the cutting edges thereof will form contour corresponding to the contour of the template. j c

G. A sub-grade template, comprising a steel beam, brackets secured to the ends thereof, guide rollers on said brackets adapted to track on the inner sides of forms at the side of the road, supporting rollers, means for adjustably supporting the same on said brackets to permit adjustment of the sub-grade template with respect to the grade of the road, a template on one side of said beam, and cutting means adjustably mounted on the opposite side of said beam.

7. A sub-grade template comprising a steel I-beam, brackets on the ends thereof, supporting rollers and guide rollers on said brackets, a template on one flange of said I-beam, shoes carried by said template, and cutter members on theopposite flange of said beam arranged to conform to the contour of the shoes on said-template.

8. A sub-rade template comprising a steel I-beam, adjustable `means for supporting the sameon the forms at the side of a road under construction, scraper means removably secured to one flange of said I-beam, a plu- Y rality of template sections secured to the other flange of said I-beam, and template shoes removably secured to said template sections.

In testimony whereof I have hereunto subscribed my name.

- ARTHUR G. FITZNER.

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